The TARDIS lands on the idyllic jungle world of Deva Loka, which is being surveyed for possible Earth colonisation. Deva Loka is already home to a race of apparent savages, however: a mysterious people with strange powers which have mentally unbalanced the members of the expedition. To make matters worse, an ancient enemy of the natives known as the Mara is intent upon revenge, and latches onto Tegan's mind as its bridgehead to victory.
Peter Davison
as The Doctor
Matthew Waterhouse
as Adric
Sarah Sutton
as Nyssa
Janet Fielding
as Tegan Jovanka
Richard Todd
as Sanders
Nerys Hughes
as Todd
Simon Rouse
as Hindle
Mary Morris
as Panna
Sarah Prince
as Karuna
Adrian Mills
as Aris
Lee Cornes
as Trickster
Jeff Stewart
as Dukkha
